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Old 10-27-2007, 06:41 PM
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Weird 383 Tuning Problem

Just installed my new 383 in my 85 chevy truck.I am having alot of problems tuning the motor,the weirdest problem right now is with my timing light .The timing light worked fine at first roughly timing the motor after startup.When i began to fine tune the motor the timing light will not flash anymore.You can hookit up it will not flash when you pull the trigger,but if you just sit there with the trigger down it will begin to flash on and off very intermitently,say 30 times,then you might stand ther for 2 or 3 min and it will flash 1 time then 2 or 3 more minutes 9 or 10 times.This is an old Craftsman light worked fine for years,because it was old I bought a new one last night,aCraftsman dial back light it does the same thing.The motor is still not timed right,because I cant get the lights to work.I am truly at a loss for to do now.I have many other problems and questions,but for now anybodyever experience this????

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Old 10-27-2007, 07:02 PM
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Move the spark pick up lead to another spot on #1 spark plug wire. (should be near the spark plug boot or near the distributor cap boot) Turn the pick up lead around the other way on the spark plug wire. (magnetic polarity)
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Old 10-27-2007, 07:07 PM
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Thanks for the quick reply.I have tried both of these and it still does not work.l
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Old 10-28-2007, 06:28 AM
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Ayuh,..... Try another Timing Light......
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Old 10-28-2007, 06:35 AM
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Maybe the wires are bad, try the light on a couple of other wires to see if you get a steady flash. Does the engine sound like it's missing?
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Old 10-28-2007, 07:26 AM
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Erratic timing

Could be a weak coil, worn rotor, bad wires, or low voltage at the distributor. You might try reducing the gap at the plug temporarily, just for timing.
You could also try using the wire going to #6 as it should fire at the same relative position on the balancer as #1. I also had problems with a Sears dial back timing light on a friends car. Haven't tried it on mine yet, but I'm wary of it. I would go check it now, but the car is parked at a Friends house for the next week or so while we are finally cutting down a bunch of trees in the yard. Sorry.
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Old 10-28-2007, 08:21 AM
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Thanks for all the replies.I went back out last night cleaned all the wires with brake cleaner and inside the pickup lead for #1 plug,just something to trysince the wires are brand new and so is the timing light.After that everything started working right.While I'm here this motor has vortec heads on it is there a certain sparkplug i should use right now I'm using a R44TSX ac delco,should I use a plug say,for a 99 Chevy truck or another year that used vortec heads.The only reason I'm using that AC Delco plug now is because that was what was in the original heads that came off the block I'm using now.Thanks for the help!
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